Reaming attachment for bits.



Patented Aug. 22, 1899..

L. JUDSON.

- BEAMING ATTACHMENT FOR BITS.

(Application filed Mar. 20, 1899.]

(No Model.)

Imus:

, load? Jwai UNITED ST T S;

PATENT OFFICE.

LOUIS JUDSON, OF CHICAGO, ILLINOIS.

R EAMING ATTACHMENT .FOR BITS.

SPECIFICATION formingpart of Letters Patent No. 631,572, dated August 22, 1899.

Application filed Mmch 1399 To all whom it may concern.-

Be it known that'I, Louis J UDSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and 'useful Improvements in Beaming Attachments for Bits; of which the following is a specification.

My invention relates to a new and improved attachment for bits used in boring circular holes in wood; and it consists of a cutting edge or blade suitably attached to or projecting from the bottom of a cylindrical tube which can be placed upon the bit and fastened in any desired position so as to determine to what depth the bit shall penetrate and to ream out 'or bevel off the edge of the cylindrical hole cut by the bit. It is intended mainly for use in boring holes for dowel-pins, which have heretofore been reamed out by hand by a separate operation, so as to enable the pins to enter their cooperating holes readily and without having to be in exact register therewith. By usingmy improved attachment I am enabled to bore the hole to any desired depth and to'ream it out to the extent desired without paying any attention whatever to the work other. than to operate the bit in the usual manner, as after the hole is completed and the edge reamed out no further penetration is possible no matter how much the bit is turned. The continued turning only cuts or tears out the threads formed in the material by the screw portion of the bit, so that it is not necessary to turn the bit backward, as is the case with the ordinary construction.

Referring to the sheet of drawings, in which the same letters of reference are used to designate identical parts in all views, Figure 1 is a side elevation of my attachment in place upon the bit, a portion of it being broken away and in section to show the action of the setscrew in holding it in place. Figs. 2 and 3 are similar views, but with the parts rotated through angles of ninety and one hundred and eighty degrees, respectively. Fig. at is a sectional view through a hole bored and finished by the attachment adjustedas shown in the preceding figures, and Fig. 5 is an inverted plan view of the attachment.

A represents the customary bit, having the screw-point B, thevertical cutting-blades 0,

Serial No. 709,725. (No model.)

the chiseling edges D, and the enlarged surface having the helical grooves E therein forming the helical ridges F thereon.

The body G of the attachment may be, as seen, a hollow cylinder, the bore of which is justlarge enough to accommodate the ridges F of the bit, and'it has a set-screw H let into one side of it, by which it is screwed in any desired position upon the bit, the end of the screw taking into one of the grooves E and insuring that the operating parts thereof shall be in proper relation to the grooves E to permit the proper discharge of the borings. The bottom of the tool has the longer segmental surface J andthe much shorter and oppositely-disposed surface K, both on the same level, and operating as stop-surfaces in the manner to be subsequently set out. Projecting downwardlyand inwardly from the surface K is the blade L, the cutting edge of which is at M. The inner and outer sides of .theblade may be curved, as seen in Figs. 1

and 3, the inner curved and cut-away side, as at N, being necessary to allow the escape of the chips cut thereby.

To permit the escape of the chips cut by the edge M upwardly, I form the angular groove 0 back of the cutting edge. This groove 0 has its side which is non-adjacent to the cutting edge M formed by the beveled surface P, the inner edge of which rests close to the rib F and prevents the borings from possibly catching between the surface of the bit and the inside of the tube G and being forced upwardly therein, thus choking the apparatus. The notch formed by the groove O and the beveled surface P, which notch I indicate generally by the letter Q, is terminated by the deeper portion R, which comes into the line of movement of the chips or borings ascending in the opposite groove E and permits their ready escape without clogging. On the other side and in rear of the cutting-blade L is formed the roundednotch S, which has its surface beveled outwardly and upwardly, so as to form a continuation, as it were, of the other groove E to insure the discharge therefrom of the borings. To

prevent the sharp point (which would be formed in the advance of the cutting edge M by the intersection of the surface K and the groove 0) from catching in the borings and stopping them, I out this point off which would be formed, and leave the triangular surface T, one side of which forms a continuation of the cutting edge.

The operation of the device will be readily apparent. The attachment is placed upon the bit so that the surfaces J and K will be above the chiseled edges D a distance equal to the depth of the hole to be bored, anditis then securely fastened by the set-screw II. The bit is now used in the ordinary manner, and it operates as usual, forming the hole U in the wood until it penetrates deep enough for the blade L to contact with the edge of the hole, after which, as the bit descends, the blade L will trim out or bevel off this edge, as seen at V in Fig. 4;, until the surfaces J and K come in contact with the surface of the wood, when any further penetration is stopped, and the further turning of the bit simply results in tearing out the threads \V, formed at the point B, so that the bit can be more readily withdrawn without being rotated backward to release it from these threads \V.

IVhile I have shown my invention as embodied in the form which I at present consider best adapted to its purpose, it will be understood that it is capable of some modifications and that I do not desire to be limited in the terms of the following claims except as may be necessitated by the state of the art.

What I claim, and desire to secure by Letters Patent of the United States, is

1. Areamingattachmentforbitsconsisting of the body portion, and means for attaching it to the bit, with a stop-surface formed by the bottom of said body portion for limiting the penetration of the bit, and the cuttingblade L projecting inwardly and downwardly from the bottom of the body portion, substantially as described.

2. A reamingattachment forbits consisting of the body portion, and means fol-attaching it to the bit, with the oppositely-disposed stopsurfaces for limiting the penetration of the bit, and the cutting-blade L projecting inwardly and downwardly from one of said stopsurfaces, substantially as described.

3. Areamingattachmentforbits consisting of the body portion, and m cans for attaching it to the bit, with a stop-surface for limiting the penetration of the bit, the cutting-blade L projecting inwardly and downwardly from the bottom of the body portion, and the notch Q arranged in advance of the blade L substantially as and for the purpose described.

-i. A reaming attachment for bits consisting of the body portion, and means for attaching it to the bit, with the stop-surface for limiting the penetration of the bit, the cutting-blade L projecting inwardly and downwardly from the bottom of the body portion, and the notch S arranged in the rear of the blade L, substantially as and for the purpose described.

5. Areamingattaehment for bits consisting of the body portion, and means for attaching it to the bit, with the stop-surfaces for limiting the penetration of the bit, the cutting-blade L projecting inwardy and downwardlyfrom the bottom of the body portion,and the notches Q and S arranged respectively in advance and in rear of the blade, substantially as and for the purpose described.

6. Areamingattachment forbits consisting of the body portion, and means for attaching it to the bit, with a stop-surface for limiting the penetration of the bit, and the cuttingblade L projecting inwardly and downwardly from the bottom of the body portion and having the curved and inwardly cut-away side at N, substantially as described.

7. Areamingattachmcntfor bits consisting of the body portion, and means for attaching it to the bit, with a stop-surface for limiting the penetration of the bit, the cutting-blade L projecting inwardly and downwardly from the bottom of the body portion, and the notch Q, arranged in advance of the blade L and composed of the groove 0, the surface P, and the portion R, all substantially as shown and described.

S. A reaming attachmentforbitsconsisting of the bodyportion, and means for attaching it to the bit, with a stop-surface for limiting the penetration of the bit, the cutting-blade L projecting inwardly and downwardly from the bottom of the body portion, the notch S arranged behind the blade L, and the notch Q arranged in advance of the blade L and composed of the groove 0, the surface I and the portion R, all substantially as shown and described.

f). Areamingattaclnncntforbitsconsisting of the body portion, and means for attaching it to the bit, with the oppositely-disposed stopsnrfaccs for limiting the penetration of the bit, the cutting-blade L projecting inwardly and downwardly from one of said stop-surfaces,thc notch S arranged behind the cuttingblade, and the notch Q arranged in advance of the blade and composed of the groove 0, the surface P and the portion R, all cooperating substantially as and for the purpose described.

' 10. A reaming attachment for bits consisting of the body portion, and means for attaching it to the bit, with the oppositely-disposed stop-surfaces for limiting the penetration of the bit, and the cutting-blade L projecting inwardlyand downwardly from one of said stopsurfaces, one of said stop-surfaces having the flattened portion T adjacent to the blade, substantially as and for the purpose described.

In witness whereof I have affixed my signature this 18th day of March, 1899.

LOUIS .IUDSON.

\Vitnesses:

LoUIsn SERAGE, ALLAN A. l\'lURRAY. 

